Number and Operations - Fractions - Apply and extend previous understandings of multiplication and division.

CCSS.Math.Content.5.NF.B.4 Apply and extend previous understandings of multiplication to multiply a fraction or whole number by a fraction.

• Online Support Sites:

  • http://www.internet4classrooms.com/common_core/apply_extend_previous_understandings_multiplication_multiply_number_operations_fractions_fifth_5th_grade_math_mathematics.htm

• CCSS.Math.Content.5.NF.B.4a
  • Interpret the product (a/b) × q as a parts of a partition of q into b equal parts; equivalently, as the result of a sequence of operations a × q ÷ b.
  • For example, use a visual fraction model to show (2/3) × 4 = 8/3, and create a story context for this equation. Do the same with (2/3) × (4/5) = 8/15. (In general, (a/b) × (c/d) = ac/bd.

  • Online Practice:

    • IXL: Multiply fractions: Multiply fractions by whole numbers I (Fifth grade - N.1)
    • IXL: Multiply fractions: Multiply fractions by whole numbers II (Fifth grade - N.2)
    • IXL Multiply fractions: Multiply fractions by whole numbers: input/output tables (Fifth grade - N.4)

• CCSS.Math.Content.5.NF.B.4b
  • Find the area of a rectangle with fractional side lengths by tiling it with unit squares of the appropriate unit fraction side lengths, and show that the area is the same as would be found by multiplying the side lengths.
  • Multiply fractional side lengths to find areas of rectangles, and represent fraction products as rectangular areas.
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  • Online Practice:

    • IXL: Geometry: Area of squares and rectangles (Fifth grade - B.16)
    • IXL: Geometry: Area and perimeter: word problems (Fifth grade - B.21)
    • IXL: Multiply fractions: Multiply fractions - with models (Fifth grade - N.5)